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FORM TP 2016150
%
TEST CODE O2IO7O2O
MAY/JUNE 2OI6
CARIBBEAN EXAMINATIONS COUNCIL
CARIBBEAN ADVANCED PROFICIENCY EXAMINATIONO
BIOLOGY
UNITl-Paper02
2 hours 30 minutes
READ THE FOLLOWING INSTRUCTIONS CAREFULLY.
This paper consists of SIX questions in TWO sections. Answer ALL
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questions.
2.
Write your answers in the spaces provided in this booklet.
J.
Do NOT write in the margins.
4.
You may use a silent, non-programmable calculator to answer questions.
5.
You are advised to take some time to read through the paper and plan your
answers.
6.
If you need to rewrite any answer and there is not enough space to do so
on the original page, you must use the extra lined page(s) provided at the
back of this booklet. Remember to draw a line through your original
answer.
7
If you use the extra page(s), you MUST write the question number
clearly in the box provided at the top of the extra page(s) and, where
relevant, include the question part beside the answer.
DO NOT TURN THIS PAGE UNTIL YOU ARE TOLD TO DO SO.
Copyright @ 2014 Caribbean Examinations Council
All rights reserved.
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02107020/CAPE 2016
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0210702003
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-4SECTION A
AnswerALL questions.
Write your answers in the spaces provided in this booklet.
1.
(a)
Figure I shows the formation of sucrose
Glucose
Fructose
+
R
x
Sucrose
Figure 1. Formation of sucrose
(i)
Name the reaction labelled R and the reaction product labelled X in Figure I
R.......
x
[2 marksl
(ii)
In the box below, illustrate the full molecular ring structure ofthe glucose molecule
involved in the reaction in Figure 1.
[2 marksl
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02107020/cAPE20t6
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0210702004
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(iii)
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With reference to the molecular structure of sucrose, explain why sucrose has an
advantage over glucose as a transport sugar in plants.
[3 marks]
(b)
(i)
Draw a simple labelled diagram to illustrate the fluid mosaic model of plasma
membrane structure.
[5 marksl
(ii)
With reference to the fluid mosaic model, explain how large polar molecules can
pass through the membrane.
[3 marksl
Total 15 marks
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02t07020lcAPE 2016
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0210702005
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2.
6
(a)
(i)
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Using a simplified diagram of a small section of ribonucleic acid (RNA), describe
the structure of RNA. Note: Details of the chemical composition of components
are NOT required.
[5 marks]
(ii)
Comment on the role of m-RNA in eukaryotes
[2 marks]
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02107020/0APE 2016
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0210702006
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-7 (b)
A plant geneticist is investigating the inheritance of genes for bitter taste (,Sz) and explosive
rind (e) in watermelon. Explosive rind is recessive and causes the watermelon to burst
when cut. Non-bitter watermelons are as a result of the homozygous recessive allele (sz).
The geneticist wishes to determine if the genes assort independently. A test cross is done
between a bitter, non-explosive plant and a plant homozygous recessive for both traits.
Table I shows the offspring produced.
TABLE 1: CATEGORIES OF OFFSPRING AND RESPECTIVE NUMBERS RECORDED
Phenotype
Number
Bitter, non-explosive
88
Bitter, explosive
68
Non-bitter, non-explosive
62
Non-bitteq explosive
81
(i)
Genotype
Determine the genotype of EACH phenotypic category in Table l, using the symbols
given. Write your answers in Table l.
(ii)
[2 marksl
Suggest a null hypothesis for the test cross in (b).
[2 marksl
(iii)
A Chi-square test is conducted on the results ofthe test cross. Table 2 is incomplete
for calculated values.
Complete Table 2 by writing the missing values in the relevant spaces.
TABLE 2z CALCULATED VALUES FOR CHI-SQUARE
TEST FOR DATA GIVEN IN TABLE T
Phenotype
Observed
Expected
(Observed - Expected )z
Expected
Bitter, non-explosive
88
Bitter, explosive
68
0.6s
Non-bitter, non-explosive
62
2.25
Non-bitter, explosive
8l
0.6s
)K2 =
[2 marksl
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02107020/CAPE 2016
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02't0702007
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-8(iv)
Using the table of probabilities provided below, and with reference to the calculated
Chi-square value from Table 2, evaluate the validity of the hypothesis.
[2 marks]
TABLB 3: CHI-SQUARE DISTRIBUTION
Probability
Degrees
of
Freedom
0.95
0.90
0.80
0.75
0.50
0.30
0.20
0.10
0.05
0.01
0.001
I
0.004
0.02
0.06
0.1 5
0.46
1.07
1.64
2.71
3.84
6.64
r 0.83
2
0.10
0.21
0.45
0.71
r.39
2.41
3.22
4.60
5.99
9.21
13.82
3
0.3s
0.58
1.01
1.42
2.37
3.66
4.64
6.25
7.82
11.34
16.27
4
0.71
1.06
1.65
2.20
3.36
4.88
5.99
7.78
9.49
13.28
18.47
5
1.14
r.6l
2.34
3.00
4.35
6.06
7.29
9.24
11.07
15.09
20.52
6
r.63
2.20
3.07
3.83
s.35
7.23
8.s6
10.64
12.59
16.81
22.46
7
2.17
2.83
3.82
4.67
6.35
8.38
9.80
12.02
14.07
18.48
24.32
8
2.73
3.49
4.59
5.53
7.34
9.52
I 1.03
13.36
15.51
20.09
26.12
9
3.32
4.17
s.38
6.39
8.34
r 0.66
12.24
r4.68
16.92
21.67
27.88
r0
3.94
4.86
6.18
7.27
9.34
11.78
13.44
15.99
t 8.31
23.21
29.59
Nonsignificant
Significant
Total 15 marks
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02107020/CAPE 2016
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0210702008
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-9(a)
Figure 2 is a photomicrograph showing a cross section of a mature anther.
Figure 2. Photomicrograph of a mature anther
Sourc e : http : //www. m i uo s copyvi ew. c om/MENU/M 1 4 - B OTA/5 1 4 A- 0 1 - 1 6/ 5 1 4 A- 0 2 A. htm
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In the box below, make a plan drawing of the anther in Figure 2. Use annotated labels to
identify TWO tissues.
[6 marksl
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02t07020lcAPE 2016
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021 0702009
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-10-
(b)
Figure 3 is a diagram of a section through the placenta with the umbilical vein.
A
B
C
Umbilical vein
Figure 3. Diagram showing a section through a placenta
Source: Biologt Unit I for CAPE Exominations by Ramesari Jones and Jones, 2011
(i)
Identify the structures labelled A, B and C and indicate whether EACH is of foetal
or maternal origin. Write your answers in the following table.
Label
Name of Structure
Foetal or Maternal Origin
A
B
C
[3 marks]
(ii)
Outline TWO functions of the placenta.
[2 marks]
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021070201cAP8 2016
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0210702010
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comment on the importance of the amnion during foetal development. In your
comment, give TWo effects of reduced levels of the amniotic fluid.
[4 marksl
Total 15 marks
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02t07020tcAPE 2016
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0210702011
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-12SECTION B
AnswerALL questions.
write your answers in the spaces provided in this booklet.
4.
(a)
According to the endosymbiotic theory, organelles such as mitochondria and chloroplasts
are thought to have evolved from prokaryotes.
(i)
Explain what is meant by the term 'endosymbiosis'and how it relates to the origin
of these organelles in eukaryotes.
[3 marks]
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02t07020lcAPE 2016
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0210702012
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(ii)
Discuss THREE lines of evidence in support of this theory.
[6 marks]
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0210702010APE 20r 6
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0210702013
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Enzymes are globular proteins and are highly specific in the reactions catalysed. Explain
the basis of enzyme specificity and include in your explanation a brief description of the
globular nature of these molecules.
[6 marksl
Total 15 marks
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02107020/CAPE 2016
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0210702014
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- 15 (a)
Evaluate the use of genetically modified organisms in agriculture. Include an explanation
of the term 'genetically modified organism'.
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02t07020lcAPE 2016
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0210702015
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[7 marksl
(b)
Explain the steps involved in the use of recombinant DNA technology for the production
of human insulin from bacteria under the following headings:
Gene isolation
Gene insertion into a vector
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02t07020lcAPE 20r6
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0210702016
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[8 marks]
Total 15 marks
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02107020/CAPE 20r6
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0210702017
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6.
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(a)
Spore production is one type ofasexual reproduction seen in fungi
(i)
Using an example with which you are familiar, give an account of the process
involved in this type of asexual reproduction.
[5 marks]
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02107020/CAPE 2016
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0210702018
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(ii)
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Fungi can also produce offspring by sexual reproduction. Discuss the
conditions under which asexual reproduction is more advantageous than sexual
reproduction.
[3 marksl
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02t07020lcAPE 2016
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0210702019
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-20 (b)
Gonadal hormones coordinate activities of the ovary and uterus in human females. Give
a brief description of the THREE main phases in the uterine cycle and for EACH phase,
comment on the role of gonadal hormones. Include the names of the gonadal hormones.
[7 marks]
Total 15 marks
END OF TEST
IF YOU FINISH BEFORB TIME IS CALLED, CHECK YOUR WORI( ON THIS TEST.
021070201CAPE 2016
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0210702020
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